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PARK FOREST, Ill. -- Homeowners in suburban Park Forest are being alerted to a series of home invasions and robberies.

Police say twice in October and twice in November, a man broke into homes, tied up the people inside, then stolen family valuables. He usually strikes in the early evening.

All of the victims have been women. The invader overpowers them, and in at least one case he beat his victim.

Police believe the same man is responsible for all four incidents. They only have a vague description because the man was wearing a mask and gloves when he robbed the homes.

"Our streets are not easy to navigate. There are curves. A lot of twists and turns. And he seems to be getting in and out of the area with some ease. So we think he may be familiar with the area," said Park Forest Police Chief Peter Green.

Police believe the cases in Park Forest may be tied to similar crimes in other south suburbs.

The homes targeted did not have security cameras but Police say they are checking surveillance cameras in the area.

Officers are increasing patrols and asking Park Forest residents to report anything suspicious, such as a strange car in the neighborhood.